Swift ios dismissViewControllerAnimated与exit之间的区别

Question

As a newbie on ios dev I wonder what the difference between dismissViewControllerAnimated(true, completion: nil) and dragging a line to the "exit" in storyboard are?

I have a view with a segue that leads into another view by modal presentation. Right now I am using dismissViewControllerAnimated(true, completion: nil) in order to go back to the prev VC. But I've seen som tutorials where they just drag a line to the exit icon/button in storyboard

Answer 1

Dismiss不会让你准备放卷过程，它只会回到上一个视图，而从退出按钮创建segue让你有机会准备放卷过程，你可以将一些模型信息从被解除的视图传递到以前的观点。

Answer 2

When dragging a line, you are presenting the previous view a second time instead of just dismissing the new view to get back to the original. This method is not advised because it wastes memory every single time the exit button is clicked. The previous view will keep on getting adding to the view stack which will accumulate memory.